[PATCH v2 4/8] powerpc/64: ret_from_fork avoid restoring regs twice
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2023-03-25 12:33:51
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
If the system call return path always restores NVGPRs then there is no need for ret_from_fork to do it. The HANDLER_RESTORE_NVGPRS does the right thing for this. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/kernel/interrupt_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S
index d60e7e7564df..bac1f89501ac 100644
--- a/arch/powerpc/kernel/interrupt_64.S
+++ b/arch/powerpc/kernel/interrupt_64.S@@ -728,14 +728,14 @@ DEFINE_FIXED_SYMBOL(__end_soft_masked, text) #ifdef CONFIG_PPC_BOOK3S _GLOBAL(ret_from_fork_scv) bl schedule_tail - REST_NVGPRS(r1) + HANDLER_RESTORE_NVGPRS() li r3,0 /* fork() return value */ b .Lsyscall_vectored_common_exit #endif _GLOBAL(ret_from_fork) bl schedule_tail - REST_NVGPRS(r1) + HANDLER_RESTORE_NVGPRS() li r3,0 /* fork() return value */ b .Lsyscall_exit
--
2.37.2